Try to clear up an ancient mystery. With help of a prominent veterinarian who says she can prove big foot exists. And is related to all of us. Nick watt tracked her down. Reporter: He's considered a cornerstone of mythology. And now, someone is saying "harry and the hendersons" could be like a documentary. To someone with a scientist background, a vet, says big foot is real and actually related us humans. I was a skeptic. I did not believe these things existed at all, prior to this study. Reporter: She's talking analysis of sasquatch fur. She believes the species developed 15,000 years ago. A hybrid cross between homo sapiens and a primate. People have never found another level of people contemporary to us. They are living under our noses. We never were able to get proof of this until now. Reporter: There have been numeral sightings. Some speakg to conan o'brien. I know he exists. There's more than one big foot? They're a species. Like a primate. Reporter: We imagine the grainy footage. And is sasquatch more real than santa claus? He has his own animal planet series. These are not just animals. These are a type of people. They don't want to be seen. They don't want to be found. Reporter: Maybe it's too weird. But even the possibility, oh, my goodness. I want to believe. Can you imagine if big foot is actually real? For "good morning america," nick watt, abc news, new york. Well, you never know. It's too bad rob lowe, when he was here being guest host. He's very excited about the big foot news. He tweeted, I have literally never been more excited reading the latest news than big foot may be real. And look at the hashtag. That would make my year.

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